一种串联有源电压质量调节器的移相控制技术

对一种串联有源电压质量调节器运行中直流侧存在的电压泵升现象进行了分析，并对采用移相控制技术来抑制直流电压泵升时电网过电压倍数、负载功率因数、移相角及补偿电压大小之间的关系进行了理论分析。以低压配电系统用串联有源电压质量调节器装置为例，对上述各量进行了计算，获得了一组控制直流电压泵升的实用设计曲线。在此基础上，提出了通过对串联有源电压质量调节器直流侧电压进行闭环控制的移相技术实现方法, 达到根据电网和负载运行状况自动对负载参考电压进行渐进移相的目的。3 kW单相串联有源电压质量调节器实验结果表明，移相及直流侧电压泵升抑制效果非常好，是一种实际可行的控制方法。

Phase Shift Control Study for a Series Active Voltage Quality Regulator

The voltage pumping-up phenomenon in DC side is analyzed for a series active voltage quality regulator in the paper. In order to avoid DC voltage pumping-up, a phase shift compensation approach is proposed, and the relationships among source overvoltage ratio, load power factor, phase shift angle and injection voltage provided by inverter are presented. Taking a series active voltage quality regulator used in low voltage distribution for example, the parameters aforementioned are calculated. A group practical design curves for suppression DC voltage pumping-up with phase shift control algorithm are obtained. Furthermore, through the closed-loop control for the DC side voltage in the series active voltage quality regulator, a phase shift implementation algorithm is presented, and it can adjust the phase of the load reference voltage gradually and automatically according to the operational conditions of grid and the load. The practicability and effectiveness are verified by a 3 kW single-phase series active quality voltage regulator's experimental results, and the performances of phase shift and suppression DC voltage pumping-up are very good.